annotate Implab/Components/ServiceLocator.cs @ 222:98eeb63cedb2

sync
author cin
date Tue, 22 Aug 2017 09:34:47 +0300
parents 240aa6994018
children bdfdba6b645b
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1 using System;
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2 using System.Collections.Generic;
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3
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4 namespace Implab.Components {
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5 /// <summary>
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6 /// Коллекция сервисов, позволяет регистрировать и получать сервисы.
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7 /// </summary>
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8 public class ServiceLocator: Disposable, IServiceLocator, IServiceProvider {
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9 // запись о сервисе
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10 struct ServiceEntry : IDisposable {
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11 public object service; // сервис
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12 public bool shared; // признак того, что сервис НЕ нужно освобождать
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13 public Func<object> activator; // активатор сервиса при первом обращении
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14 public Action<object> cleanup; // функция для очистки сервиса
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15 public List<Type> associated; // ссылки на текущую запись
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16 public Type origin; // ссылка на оригинальную запись о сервисе
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17
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18 #region IDisposable implementation
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19
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20 public void Dispose() {
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21 if (shared)
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22 return;
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23 if (cleanup != null) {
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24 if (service != null)
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25 cleanup(service);
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26 } else
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27 Safe.Dispose(service);
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28 }
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29
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30 #endregion
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31 }
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32
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33 // словарь существующих сервисов
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34 readonly Dictionary<Type, ServiceEntry> m_services = new Dictionary<Type,ServiceEntry>();
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35
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36 /// <summary>
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37 /// Получает объект предоставляющий сервис <typeparamref name="T"/>.
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38 /// </summary>
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39 /// <typeparam name="T">Тип запрашиваемого сервиса</typeparam>
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40 /// <returns>Объект, реализующий сервис</returns>
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41 /// <exception cref="KeyNotFoundException">Сервис не зарегистрирован</exception>
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42 public T GetService<T>() {
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43 object result;
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44 if (TryGetService(typeof(T), out result))
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45 return (T)result;
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46 throw new ApplicationException (String.Format ("{0} doesn't provide {1} service", this, typeof(T)));
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47 }
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48
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49
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50 /// <summary>
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51 /// Пытается получить указанный сервис, в случае, если компонента не предоставляет требуемый сервис
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52 /// не возникает исключений.
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53 /// </summary>
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54 /// <typeparam name="T">Тип требуемого сервиса.</typeparam>
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55 /// <param name="service">Объект реализующий сервис, или <c>default(T)</c> если такового нет.</param>
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56 /// <returns><c>true</c> - сервис найден, <c>false</c> - сервис не зарегистрирован.</returns>
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57 public bool TryGetService<T>(out T service) {
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58 object result;
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59 if (TryGetService(typeof(T), out result)) {
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60 service = (T)result;
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61 return true;
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62 }
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63 service = default(T);
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64 return false;
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65 }
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66
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67 /// <summary>
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68 /// Получает объект предоставляющий сервис <paramref name="serviceType"/>
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69 /// </summary>
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70 /// <param name="serviceType">Тип запрашиваемого сервиса</param>
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71 /// <returns>Объект, реализующий сервис</returns>
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72 /// <exception cref="KeyNotFoundException">Сервис не зарегистрирован</exception>
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73 public object GetService(Type serviceType) {
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74 object result;
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75 if (TryGetService(serviceType, out result))
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76 return result;
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77 throw new ApplicationException (String.Format ("{0} doesn't provide {1} service", this, serviceType));
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78 }
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79
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80 /// <summary>
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81 /// Пытается получить требуемый сервис или совместимый с ним.
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82 /// </summary>
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83 /// <returns><c>true</c>, если сервис был найден, <c>false</c> в противном случае..</returns>
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84 /// <param name="serviceType">Тип запрашиваемого сервиса.</param>
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85 /// <param name="service">Искомый сервис.</param>
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86 public virtual bool TryGetService(Type serviceType, out object service) {
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87 Safe.ArgumentNotNull(serviceType, "serviceType");
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88 AssertNotDisposed();
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89
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90 ServiceEntry se;
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91 if (!m_services.TryGetValue(serviceType, out se)) {
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92 // ищем ближайщий объект, реализующий нужный сервис
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93 Type pt = null;
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94 foreach (var t in m_services.Keys)
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95 if (serviceType.IsAssignableFrom(t) && (pt == null || t.IsAssignableFrom(pt)))
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96 pt = t;
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97
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98 if (pt == null) {
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99 // нет нужного сервиса
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100 service = null;
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101 return false;
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102 }
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103
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104 var pe = m_services[pt];
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105
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106 // найденная запись может ссылаться на оригинальную запись с сервисом
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107 if(pe.origin != null) {
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108 pt = pe.origin;
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109 pe = m_services[pt];
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110 }
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111
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112 // добавляем список с обратными ссылками
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113 if (pe.associated == null)
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114 pe.associated = new List<Type>();
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115
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116 pe.associated.Add(serviceType);
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117
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118 // обновляем родительскую запись
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119 m_services[pt] = pe;
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120
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121 // создаем запись со ссылкой
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122 se = new ServiceEntry {
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123 service = pe.service,
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124 origin = pt,
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125 shared = true // предотвращаем множественные попытки освобождения
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126 };
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127
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128 m_services[serviceType] = se;
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129 }
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130
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131 // запись содержит в себе информацию о сервисе
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132 if (se.service != null) {
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133 service = se.service;
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134 return true;
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135 }
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136
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137 // текущая запись является ссылкой
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138 if (se.origin != null) {
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139 se.service = GetService(se.origin);
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140 m_services[serviceType] = se;
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141 service = se.service;
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142 return true;
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143 }
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144
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145 // текущая запись не является ссылкой и не имеет информации о сервисе
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146 // она должна сожержать информацию об активации
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147 if (se.activator != null) {
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148 se.service = se.activator();
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149
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150 m_services[serviceType] = se;
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151
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152 service = se.service;
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153 return true;
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154 }
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155
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156 service = null;
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157 return false;
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158 }
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159
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160 /// <summary>
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161 /// Регистрирует фабрику для активации сервиса по первому требованию.
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162 /// </summary>
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163 /// <typeparam name="T">Тип регистрируемого сервиса.</typeparam>
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164 /// <param name="activator">Фабрика для создания/получения объекта, предоставляющего сервис.</param>
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165 /// <param name = "cleanup">Метод для освобождения экземпляра сервиса, будет вызыван при освобождении сервис-локатора.</param>
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166 /// <remarks>При освобождении сервис-локатора, сервисы полученные в результате активации также будут освобождены.</remarks>
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167 public void Register<T>(Func<T> activator, Action<T> cleanup) {
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168 Safe.ArgumentNotNull(activator, "activator");
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169
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170 AssertNotDisposed();
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171
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172 Unregister(typeof(T));
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173
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174 var serviceEntry = new ServiceEntry();
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175 serviceEntry.activator = () => activator();
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176 if (cleanup != null)
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177 serviceEntry.cleanup = instance => cleanup((T)instance);
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178 m_services[typeof(T)] = serviceEntry;
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179 }
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180
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181 public void Register<T>(Func<T> activator) {
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182 Register(activator, null);
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183 }
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184
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185 /// <summary>
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186 /// Регистрирует объект, предоставляющий сервис.
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187 /// </summary>
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188 /// <typeparam name="T">Тип регистрируемого сервиса.</typeparam>
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189 /// <param name="service">Объект, предоставляющий сервис.</param>
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190 /// <exception cref="InvalidOperationException">Указанный сервис уже зарегистрирован.</exception>
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191 /// <remarks>Сервис-локатором не управляет временем жизни объекта для зарегистрированного сервиса.</remarks>
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192 public void Register<T>(T service) {
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193 Register(service, true);
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194 }
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195
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196 /// <summary>
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197 /// Регистрирует объект, предоставляющий сервис. Повторная регистрация отменяет уже существующую.
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198 /// </summary>
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199 /// <typeparam name="T">Тип регистрируемого сервиса.</typeparam>
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200 /// <param name="service">Объект, предоставляющий сервис.</param>
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201 /// <param name="shared">Признак того, что объект является разделяемым и сервис-локатор не должен его освобождать.</param>
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202 public void Register<T>(T service, bool shared) {
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203 Safe.ArgumentNotNull(service, "service");
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204
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205 AssertNotDisposed();
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206
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207 Unregister(typeof(T));
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208
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209 m_services[typeof(T)] = new ServiceEntry { service = service, shared = shared };
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210 }
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211
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212 public void Unregister(Type serviceType) {
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213 Safe.ArgumentNotNull(serviceType, "serviceType");
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214
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215 AssertNotDisposed();
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216
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217 ServiceEntry se;
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218 if (m_services.TryGetValue(serviceType, out se)) {
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219 if (se.origin != null) {
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220 var pe = m_services[se.origin];
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221 pe.associated.Remove(serviceType);
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222 }
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223 // освобождаем ресурсы
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224 se.Dispose();
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225 m_services.Remove(serviceType);
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226
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227 // убираем связанные записи
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228 if (se.associated != null)
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229 foreach (var item in se.associated)
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230 m_services.Remove(item);
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231 }
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232 }
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233
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234 /// <summary>
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235 /// Освобождает зарегистрированные сервисы (которые требуется освобоить).
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236 /// </summary>
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237 /// <param name="disposing">Призанак того, что нужно освободить ресурсы.</param>
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238 protected override void Dispose(bool disposing) {
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239 if (disposing) {
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240
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241 foreach (var entry in m_services.Values)
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242 entry.Dispose();
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243
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244 }
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245 base.Dispose(disposing);
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246 }
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247 }
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248 }